Commitments and Contingent Liabilities - Other (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended																12 Months Ended
	Jul. 29, 2016	Dec. 28, 2014	Sep. 29, 2013	Dec. 25, 2016		Sep. 25, 2016	[1]	Jun. 26, 2016	[1]	Mar. 27, 2016	[1]	Dec. 27, 2015	[2]	Sep. 27, 2015	[2]	Jun. 28, 2015	[2]	Mar. 29, 2015	[2]	Dec. 25, 2016		Dec. 27, 2015		Dec. 28, 2014		Dec. 29, 2013
Loss Contingencies [Line Items]
Multiemployer pension plan withdrawal expense	$ (5,000)			$ 0	[1]	$ (4,971)		$ 11,701		$ 0		$ 4,358		$ 0		$ 0		$ 4,697		$ 6,730	[1]	$ 9,055	[2]	$ 0	[1]
Settlement agreement included in discontinued operations																								(975)
Threatened Litigation [Member]
Loss Contingencies [Line Items]
Demand for payment		$ 34,000	$ 26,000
Decline in contributions, percent			70.00%
Partial pension withdrawal arbitration liability				9,700																9,700
Payments made in accordance with ERISA																				11,700
Expense recognized related to Initial and Revised Assessment																				10,700		$ 6,800		3,600
Maximum [Member]
Loss Contingencies [Line Items]
Partial pension withdrawal contingent loss				10,000																10,000
New England Media Group [Member]
Loss Contingencies [Line Items]
Settlement agreement included in discontinued operations				$ (3,700)																$ (3,651)				$ (349)		$ 47,600

[1] We recorded a charge in the second quarter related to a partial withdrawal obligation under a multiemployer pension plan following an unfavorable arbitration decision, of which $5 million was reimbursed to the Company in the third quarter.

[2] We recorded charges related to partial withdrawal obligations under multiemployer pension plans in the first and fourth quarters.